Malicious PDF — malware analysis report

Static analysis result for SHA-256 3865b154838c6188…

MALICIOUS

PDF

38.9 KB Created: 2020-08-10 23:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 29b7f776b354ee991f2aa4a5ab69d176 SHA-1: 536c02d3042eeab25ac9254306d2e3bda64fca22 SHA-256: 3865b154838c618843e39c2acf5dfb79e0c46c026d5e39416031494e36c1cb40
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains garbled text and a URL that appears to be part of the link farm. The primary purpose seems to be SEO manipulation or distributing further malicious content through the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=cinquenta+tons+de+cinza+pdf+le+livros In PDF document text
    • http://xuxanebi.joeledoux.com/uploads/1/3/1/4/131437987/7188512.pdfIn PDF document text
    • http://files.anastasiaabrahim.com/uploads/1/3/0/7/130740623/5773132.pdfIn PDF document text
    • http://files.flblinds.com/uploads/1/3/2/6/132695568/wemexuvarodakiv-lesiba-dilugaparisufix.pdfIn PDF document text
    • http://files.laurajentertainment.com/uploads/1/3/1/4/131437880/zejibazotalasolugaj.pdfIn PDF document text
    • http://files.ashleighhaddad.com/uploads/1/3/1/8/131856519/7327962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/free_mechanical_aptitude_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4522/2557/files/bbg_workout.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/25140803717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/12336008703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6839/1591/files/non_ruminant_animal_production.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2033782386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/png_magic_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/83038723042.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1534434062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/buwadetuz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A4 5292 bytes
SHA-256: 5362c02b50b4aa9dc68af26ba55f32fbe6365222ccf310cd1bf6ca591183a01a
font_01_sfnt_off000069bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BD 11540 bytes
SHA-256: d20d9c5ab9f31a0f1dbb036aaf2aef42ebd84cf0e80e0ae445413e1e43d42491

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